:root {
  --ivory: #f7f3eb;
  --ivory-deep: #eee8dc;
  --paper: #fffdf8;
  --charcoal: #252624;
  --muted: #6f706b;
  --navy: #102a43;
  --navy-soft: #dce4e9;
  --coral: #e45d52;
  --coral-soft: #f7d8d2;
  --line: rgba(16, 42, 67, 0.18);
  --serif: Iowan Old Style, Baskerville, "Times New Roman", "Songti SC", serif;
  --sans: Inter, "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--charcoal);
  background:
    radial-gradient(circle at 84% 4%, rgba(228, 93, 82, 0.09), transparent 23rem),
    var(--ivory);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid rgba(228, 93, 82, 0.35);
  outline-offset: 4px;
}

.shell {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(16, 42, 67, 0.1);
  background: rgba(247, 243, 235, 0.9);
  backdrop-filter: blur(16px);
}

.nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-family: var(--serif);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: inline-grid;
  width: 27px;
  height: 27px;
  margin-right: 9px;
  place-items: center;
  color: var(--ivory);
  background: var(--navy);
  border-radius: 50%;
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 700;
  vertical-align: 2px;
}

.nav-label {
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.55fr);
  gap: 72px;
  align-items: end;
  padding: 92px 0 70px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--coral);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 840px;
  margin-bottom: 24px;
  font-size: clamp(3.2rem, 7vw, 6.7rem);
  line-height: 0.93;
}

.hero-lead {
  max-width: 680px;
  margin-bottom: 0;
  color: #444641;
  font-family: var(--serif);
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  line-height: 1.55;
}

.library-note {
  padding-left: 22px;
  border-left: 2px solid var(--coral);
  color: var(--muted);
  font-size: 0.94rem;
}

.library-note strong {
  display: block;
  margin-bottom: 7px;
  color: var(--navy);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.category-nav-wrap {
  padding: 30px 0 0;
}

.category-nav {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.category-filter {
  min-height: 116px;
  padding: 20px;
  text-align: left;
  color: var(--navy);
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}

.category-filter:hover,
.category-filter.is-active {
  color: var(--paper);
  background: var(--navy);
}

.category-filter:hover {
  transform: translateY(-2px);
}

.filter-number {
  display: block;
  margin-bottom: 23px;
  font-family: var(--mono);
  font-size: 0.7rem;
  opacity: 0.65;
}

.filter-name {
  display: block;
  font-family: var(--serif);
  font-size: 1.06rem;
}

.library-actions {
  display: flex;
  justify-content: flex-end;
  padding: 22px 0 0;
}

.button {
  display: inline-flex;
  min-height: 48px;
  padding: 0 20px;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--paper);
  background: var(--navy);
  border: 1px solid var(--navy);
  border-radius: 999px;
  font-size: 0.87rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover:not(:disabled) {
  background: var(--coral);
  border-color: var(--coral);
  transform: translateY(-2px);
}

.button.secondary {
  color: var(--navy);
  background: transparent;
}

.button:disabled,
.button.is-disabled {
  color: #777872;
  background: transparent;
  border-color: rgba(37, 38, 36, 0.22);
  cursor: not-allowed;
}

.button .button-status {
  font-family: var(--mono);
  font-size: 0.67rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.catalog {
  padding: 74px 0 110px;
}

.category-section {
  display: grid;
  grid-template-columns: minmax(210px, 0.4fr) minmax(0, 1fr);
  gap: 70px;
  padding: 54px 0 68px;
  border-top: 1px solid var(--line);
}

.category-section[hidden] {
  display: none;
}

.category-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--coral);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.category-kicker::before {
  width: 20px;
  height: 1px;
  background: currentColor;
  content: "";
}

.category-heading {
  margin-bottom: 16px;
  color: var(--navy);
  font-size: clamp(2rem, 3vw, 3.1rem);
  line-height: 1.04;
}

.category-copy {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 0.92rem;
}

.category-download {
  border: 0;
  padding: 0;
  color: var(--muted);
  background: none;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.035em;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.skill-card {
  position: relative;
  min-height: 330px;
  padding: 28px;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid rgba(16, 42, 67, 0.16);
  display: flex;
  flex-direction: column;
  transition: transform 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.skill-card::after {
  position: absolute;
  right: -44px;
  bottom: -62px;
  width: 170px;
  height: 170px;
  border: 1px solid var(--coral-soft);
  border-radius: 50%;
  box-shadow: 0 0 0 22px rgba(247, 216, 210, 0.25), 0 0 0 44px rgba(247, 216, 210, 0.13);
  content: "";
}

.skill-card:hover {
  border-color: var(--coral);
  box-shadow: 0 22px 50px rgba(16, 42, 67, 0.08);
  transform: translateY(-4px);
}

.skill-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 52px;
}

.tag {
  display: inline-flex;
  min-height: 28px;
  padding: 0 10px;
  align-items: center;
  border: 1px solid rgba(16, 42, 67, 0.2);
  border-radius: 999px;
  color: var(--navy);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.skill-card h3 {
  position: relative;
  z-index: 1;
  margin-bottom: 13px;
  color: var(--navy);
  font-size: clamp(2rem, 3.2vw, 3rem);
  line-height: 1;
}

.skill-summary {
  position: relative;
  z-index: 1;
  max-width: 480px;
  margin-bottom: 36px;
  color: #50524d;
  font-size: 1rem;
}

.skill-card-footer {
  position: relative;
  z-index: 1;
  display: flex;
  margin-top: auto;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.text-link {
  color: var(--navy);
  font-size: 0.88rem;
  font-weight: 700;
}

.text-link::after {
  display: inline-block;
  margin-left: 9px;
  color: var(--coral);
  content: "↗";
  transition: transform 180ms ease;
}

.text-link:hover::after {
  transform: translate(3px, -3px);
}

.release-note {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.empty-shelf {
  min-height: 188px;
  padding: 28px;
  display: grid;
  place-items: center start;
  border: 1px dashed rgba(16, 42, 67, 0.25);
  color: var(--muted);
}

.empty-shelf p {
  max-width: 390px;
  margin: 0;
  font-family: var(--serif);
  font-size: 1.08rem;
}

.site-footer {
  padding: 26px 0 42px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
}

.detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 78px;
  padding: 84px 0 76px;
  align-items: end;
  border-bottom: 1px solid var(--line);
}

.back-link {
  display: inline-flex;
  margin-bottom: 54px;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.82rem;
}

.back-link::before {
  color: var(--coral);
  content: "←";
}

.detail-title {
  max-width: 780px;
  margin-bottom: 24px;
  color: var(--navy);
  font-size: clamp(3.6rem, 8vw, 7.7rem);
}

.detail-summary {
  max-width: 760px;
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  line-height: 1.48;
}

.detail-aside {
  padding: 28px;
  color: var(--paper);
  background: var(--navy);
}

.detail-aside .tag {
  color: var(--paper);
  border-color: rgba(255, 253, 248, 0.34);
}

.detail-aside-label {
  margin: 28px 0 10px;
  color: rgba(255, 253, 248, 0.6);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.detail-aside p:last-child {
  margin-bottom: 0;
}

.detail-content {
  padding: 84px 0 112px;
}

.detail-block {
  display: grid;
  grid-template-columns: minmax(180px, 0.35fr) minmax(0, 0.9fr);
  gap: 72px;
  padding: 58px 0;
  border-top: 1px solid var(--line);
}

.detail-block-label {
  color: var(--coral);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.detail-block h2 {
  margin-bottom: 22px;
  color: var(--navy);
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.06;
}

.detail-block-copy {
  max-width: 720px;
  color: #4d4e4a;
  font-size: 1.08rem;
}

.scenario-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.scenario-list li {
  min-height: 126px;
  padding: 22px 22px 22px 48px;
  position: relative;
  color: var(--navy);
  background: rgba(255, 253, 248, 0.75);
  border: 1px solid rgba(16, 42, 67, 0.14);
}

.scenario-list li::before {
  position: absolute;
  top: 23px;
  left: 21px;
  color: var(--coral);
  content: "◆";
  font-size: 0.55rem;
}

.mechanism {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 34px;
}

.mechanism-step {
  min-height: 132px;
  padding: 20px;
  position: relative;
  display: flex;
  align-items: flex-end;
  color: var(--navy);
  border-top: 1px solid var(--navy);
  border-bottom: 1px solid var(--navy);
  border-left: 1px solid var(--navy);
  font-family: var(--serif);
  font-size: 1.2rem;
}

.mechanism-step:last-child {
  color: var(--paper);
  background: var(--navy);
  border-right: 1px solid var(--navy);
}

.mechanism-step::before {
  position: absolute;
  top: 16px;
  left: 18px;
  color: var(--coral);
  font-family: var(--mono);
  font-size: 0.64rem;
  content: attr(data-step);
}

.download-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 44px;
  padding: 38px;
  align-items: center;
  background: var(--coral-soft);
  border: 1px solid rgba(228, 93, 82, 0.24);
}

.download-panel h2 {
  margin-bottom: 10px;
  color: var(--navy);
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.download-panel p {
  max-width: 650px;
  margin-bottom: 0;
  color: #5d4c48;
}

.download-panel .button {
  min-width: 238px;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 24px;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-top: 72px;
  }

  .category-nav {
    grid-template-columns: repeat(2, 1fr);
  }

  .category-section {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .skill-grid {
    grid-template-columns: 1fr;
  }

  .detail-hero {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .detail-block {
    grid-template-columns: 1fr;
    gap: 22px;
  }
}

@media (max-width: 620px) {
  .shell {
    width: min(calc(100% - 28px), var(--max));
  }

  .nav {
    min-height: 64px;
  }

  .nav-label {
    display: none;
  }

  .hero {
    padding: 58px 0 50px;
  }

  h1 {
    font-size: clamp(3rem, 17vw, 4.5rem);
  }

  .category-nav {
    display: flex;
    margin-right: -14px;
    padding-right: 14px;
    overflow-x: auto;
    border-left: 0;
    scroll-snap-type: x mandatory;
  }

  .category-filter {
    min-width: 166px;
    min-height: 100px;
    scroll-snap-align: start;
  }

  .filter-number {
    margin-bottom: 16px;
  }

  .library-actions {
    justify-content: stretch;
  }

  .library-actions .button {
    width: 100%;
  }

  .catalog {
    padding: 52px 0 76px;
  }

  .category-section {
    padding: 44px 0 54px;
  }

  .skill-card {
    min-height: 348px;
    padding: 22px;
  }

  .skill-card-footer,
  .footer-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .detail-hero {
    padding: 52px 0 54px;
  }

  .back-link {
    margin-bottom: 42px;
  }

  .detail-title {
    font-size: clamp(3.4rem, 18vw, 5.2rem);
  }

  .detail-content {
    padding: 56px 0 78px;
  }

  .detail-block {
    padding: 44px 0;
  }

  .scenario-list {
    grid-template-columns: 1fr;
  }

  .mechanism {
    grid-template-columns: repeat(2, 1fr);
  }

  .mechanism-step:nth-child(2) {
    border-right: 1px solid var(--navy);
  }

  .mechanism-step:nth-child(n + 3) {
    border-top: 0;
  }

  .download-panel {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 26px;
  }

  .download-panel .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* Round two: retain the existing palette and templates; soften their rhythm. */
:root { --coral-ink: #b94236; }
body { background: radial-gradient(ellipse at 89% 16%, rgba(239, 150, 118, .17), transparent 36rem), var(--ivory); }
.brand { font-size: 1.3rem; letter-spacing: .04em; }
.nav-label { color: var(--navy); font-size: .88rem; letter-spacing: .06em; }
.eyebrow, .category-kicker { color: var(--coral-ink); font-size: .78rem; }
.button { background: var(--coral); border-color: var(--coral); color: var(--navy); }
.button:hover:not(:disabled) { background: var(--navy); border-color: var(--navy); color: var(--paper); }
.button.secondary { border-color: var(--line); }
.button:disabled { background: transparent; color: var(--muted); border-color: var(--line); }
.library-hero { grid-template-columns: 1.95fr 1fr; gap: 48px; padding: 68px 0 60px; border-bottom: 0; }
.hero-statement { max-width: none; color: var(--navy); font-size: clamp(2.45rem, 4.3vw, 3.85rem); line-height: 1.56; letter-spacing: -.035em; margin-bottom: 0; }
.hero-statement span { display: block; white-space: nowrap; }
.hero-statement span:nth-child(2) { padding-left: 30px; }
.hero-statement .coral-line { padding-left: 60px; color: var(--coral-ink); text-decoration: underline; text-decoration-color: var(--coral-soft); text-decoration-thickness: 6px; text-underline-offset: 12px; }
.hero-introduction { padding: 0 0 9px; }
.hero-introduction h2 { font-size: 1.5rem; line-height: 1.45; font-weight: 600; color: var(--navy); margin-bottom: 14px; }
.hero-introduction p { font-size: 1rem; color: #565953; line-height: 1.9; margin-bottom: 24px; }
.category-nav-wrap { padding-top: 12px; scroll-margin-top: 98px; }
.category-nav { display: flex; align-items: stretch; gap: 8px; border: 0; border-bottom: 1px solid var(--line); padding-bottom: 16px; }
.category-filter { flex: 1; min-height: 76px; padding: 14px 10px; text-align: center; border: 0; border-radius: 4px 18px 4px 18px; }
.category-filter:first-child { flex: .65; }
.category-filter.is-active, .category-filter:hover { color: var(--navy); background: var(--coral-soft); }
.category-filter.is-active { box-shadow: inset 0 -3px 0 var(--coral); }
.filter-name { font-size: 1rem; white-space: nowrap; }
.coming-soon { display: block; margin-top: 5px; color: var(--muted); font-family: var(--mono); font-size: .75rem; }
.library-actions { padding-top: 20px; }
.library-actions .button { min-height: 42px; font-weight: 400; font-size: .88rem; }
.catalog { padding: 28px 0 76px; }
.category-section { border-top: 0; grid-template-columns: .65fr 1.35fr; gap: 72px; padding: 30px 0 32px; align-items: center; }
.category-heading { font-size: 2.5rem; }
.category-copy { font-size: 1rem; max-width: 270px; }
.category-download { font: .875rem var(--sans); background: transparent; }
.category-download:disabled { cursor: not-allowed; color: var(--muted); }
a.category-download { color: var(--coral-ink); text-decoration: underline; text-underline-offset: 5px; }
.skill-grid { grid-template-columns: 1fr; }
.skill-card { min-height: 328px; padding: 32px 36px; border-radius: 4px 44px 4px 4px; background: linear-gradient(125deg, var(--paper) 60%, #fbebe3); }
.skill-card::after { right: -65px; bottom: -82px; }
.skill-meta { margin-bottom: 28px; }
.tag { font-size: .75rem; }
.card-english { color: var(--muted); margin: 0 0 9px; font-family: var(--mono); font-size: .8rem; }
.skill-card h3 { font-size: 2.8rem; margin-bottom: 16px; }
.skill-summary { max-width: 430px; line-height: 1.8; }
.text-link { color: var(--coral-ink); }
.text-link:hover { color: var(--navy); }
.filter-empty { margin: 12px 0 22px; padding: 22px 0; color: var(--muted); font-size: 1rem; }
.site-footer { font-size: .85rem; }
.detail-hero { padding: 52px 0 58px; grid-template-columns: 1.7fr .7fr; gap: 100px; }
.back-link { margin-bottom: 36px; font-size: .88rem; }
.detail-title { font-size: clamp(3.5rem, 6.6vw, 5.5rem); line-height: 1.2; }
.detail-summary { font-size: clamp(1.25rem, 2vw, 1.55rem); line-height: 1.8; max-width: 660px; }
.detail-aside { background: transparent; color: var(--navy); padding: 22px 0 0 28px; border-left: 2px solid var(--coral); }
.detail-aside .skill-meta { margin-bottom: 12px; }
.detail-aside .tag { color: var(--navy); border-color: var(--line); }
.detail-aside > p { font-size: .9rem; color: var(--muted); }
.detail-aside .leverage-note { font-size: 1.7rem; font-family: var(--serif); color: var(--navy); line-height: 1.6; margin: 24px 0; }
.leverage-note em { color: var(--coral-ink); font-style: normal; }
.detail-content { padding: 0 0 76px; }
.detail-block { grid-template-columns: .65fr 1.6fr; gap: 76px; padding: 58px 0; }
.detail-block:first-child { border-top: 0; }
.detail-block .section-title { font-size: 1.7rem; line-height: 1.5; letter-spacing: 0; }
.section-caption { color: var(--muted); font-family: var(--serif); font-size: 1.05rem; line-height: 1.8; }
.content-title { font-size: 2.15rem; line-height: 1.5; color: var(--navy); margin-bottom: 20px; }
.detail-block-copy { font-size: 1.05rem; line-height: 1.9; }
.decision-list, .scenario-list { display: block; list-style: none; padding: 0; margin: 24px 0 0; }
.decision-list li, .scenario-list li { min-height: 0; position: relative; background: transparent; border: 0; padding: 7px 0 7px 21px; color: #454942; font-size: 1rem; }
.decision-list li::before, .scenario-list li::before { content: '—'; font-size: 1rem; position: absolute; left: 0; top: 7px; color: var(--coral-ink); }
.attention-statement { font-family: var(--serif); font-size: 1.6rem; line-height: 1.8; color: var(--navy); margin-bottom: 22px; }
.attention-statement strong { color: var(--coral-ink); font-weight: 500; }
.principles { list-style: none; padding: 0; margin: 0; }
.principle { display: grid; grid-template-columns: 40px 1fr; gap: 22px; padding: 23px 0; border-bottom: 1px solid var(--line); }
.principle:first-child { padding-top: 0; }
.principle:last-child { border: 0; padding-bottom: 0; }
.principle-number { color: var(--coral-ink); font-family: var(--mono); font-size: 1rem; padding-top: 4px; }
.principle h3 { color: var(--navy); font-size: 1.3rem; line-height: 1.5; margin-bottom: 9px; letter-spacing: 0; }
.principle p { color: #62655e; font-size: 1rem; line-height: 1.8; margin-bottom: 0; }
.closing-thought { margin: 30px 0 0; padding-left: 20px; border-left: 2px solid var(--coral); font-family: var(--serif); font-size: 1.15rem; line-height: 1.8; color: var(--navy); }
.download-panel { scroll-margin-top: 104px; border: 0; border-radius: 4px 40px 4px 4px; padding: 38px; background: linear-gradient(100deg, #f6e4da, #f7d8d2); }
.download-panel h2 { font-size: 2.35rem; line-height: 1.4; }
.download-action { text-align: center; }
.download-action .button { min-width: 190px; }
.download-action .button:disabled { border-color: var(--coral); background: var(--coral); color: var(--navy); opacity: .65; }
.download-action p { margin-top: 10px; font-size: .85rem; }
@media (max-width: 1000px) {
  .library-hero { gap: 30px; grid-template-columns: 1.65fr 1fr; }
  .hero-statement { font-size: 2.6rem; }
  .hero-statement span:nth-child(2) { padding-left: 12px; }
  .hero-statement .coral-line { padding-left: 22px; }
  .category-nav { gap: 2px; }
  .detail-hero { gap: 42px; }
}
@media (max-width: 760px) {
  .library-hero { grid-template-columns: 1fr; padding: 42px 0 28px; gap: 34px; }
  .hero-statement { font-size: clamp(1.7rem, 6.4vw, 2.9rem); }
  .hero-introduction { max-width: 510px; padding-left: 22px; }
  .hero-introduction h2 { font-size: 1.28rem; }
  .category-nav { flex-wrap: wrap; border: 0; overflow: visible; margin: 0; padding: 0; gap: 6px; }
  .category-filter, .category-filter:first-child { flex: 0 1 calc(33.333% - 4px); min-width: 0; min-height: 70px; padding: 11px 5px; }
  .filter-name { white-space: normal; font-size: .9rem; }
  .coming-soon { font-size: .75rem; }
  .category-section { grid-template-columns: 1fr; gap: 28px; padding-top: 18px; }
  .category-heading { font-size: 2rem; }
  .category-copy { max-width: none; margin-bottom: 12px; }
  .category-kicker { margin-bottom: 10px; }
  .skill-card { padding: 28px; }
  .detail-hero { grid-template-columns: 1fr; gap: 32px; padding: 36px 0 40px; }
  .detail-aside { display: block; border: 0; padding: 0; }
  .detail-aside .leverage-note, .detail-aside > p[data-category-name] { display: none; }
  .detail-aside .skill-meta { margin-bottom: 14px; }
  .detail-title { font-size: 3.5rem; }
  .detail-block { grid-template-columns: 1fr; gap: 20px; padding: 38px 0; }
  .detail-block .section-title { font-size: 1.4rem; margin-bottom: 0; }
  .content-title { font-size: 1.7rem; }
  .section-caption { margin: 10px 0 0; }
  .attention-statement { font-size: 1.4rem; }
  .principle { grid-template-columns: 28px 1fr; gap: 13px; }
  .download-panel { grid-template-columns: 1fr; gap: 24px; padding: 28px; }
  .download-panel h2 { font-size: 1.85rem; }
  .nav-label { display: block; }
}